An oil-free scroll fluid machine

ABSTRACT

An oil-free scroll fluid machine includes an inner casing used as or not as a fixed scroll, and an outer casing used as a fixed scroll. The inner casing is butted with the outer casing to form a seal chamber. An orbiting scroll, which is installed on an eccentric part of an eccentric spindle through a group of bearings, is arranged in the seal chamber. The orbiting scroll is driven by the eccentric spindle and restricted by orbiting scroll anti-rotation crank pins to make a planar revolution in the seal chamber. The orbiting scroll is meshed with the fixed scroll to form several crescent compressed and sealed gas chambers with gradually reduced volumes from an outer edge to a center thereof, and therefore gas is sucked in from a gas inlet on the outer edge and exhausted through an exhaust port of the machine.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority of Chinese patent application No. 201310208433.1, filed on May 29, 2013, which is incorporated herewith by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the field of fluid machinery, in particular to an oil-free scroll fluid machine.

2. The Prior Arts

The common existing oiled air compressor and oil-sealed vacuum pump are lubricated and sealed by oil, which results in oil pollution of compressed fluid, vacuum chamber and external environment; while the existing oil-free compressor and oil-free vacuum pump, such as reciprocating compressor, roots oil-free vacuum pump and claw oil-free vacuum pump, have the disadvantages of high vibration, high noise, large volume, heavy energy consumption, etc., furthermore, when gas-liquid mixture and corrosive gas are pumped, the gas-liquid mixture and corrosive gas will accumulate and stagnate in the compression chamber of a horizontal oil-free scroll vacuum pump, especially in the exhaust port of the pump, and conglomeration of corrosive medium may be produced, which can influence the performance of the pump.

SUMMARY OF THE INVENTION

In terms of the problems of the prior art, the present invention provides an oil-free scroll fluid machine. The present invention comprises a double-sided oil-free scroll fluid machine and a single-sided oil-free scroll fluid machine. The oil-free scroll fluid machine of the present invention can be used as compressor and vacuum pump.

The purpose of the present invention is achieved by the following technical schemes: a double-sided oil-free scroll fluid machine, comprising a machine frame, an inner casing and an outer casing, wherein the inner casing is fixed on the machine frame, provided with a gas inlet on the outer edge and an exhaust port, and is used as an inner fixed scroll, the outer casing is used as an outer fixed scroll and is butted with the inner casing which is used as the inner fixed scroll to form a seal chamber, an orbiting scroll which is installed on the eccentric part of an eccentric spindle through a group of bearings is arranged in the seal chamber, a fan wheel and a coupling fan wheel are respectively arranged on both ends of the eccentric spindle, the eccentric spindle is connected with a drive motor through a coupling and is eccentrically driven by the drive motor, the orbiting scroll is driven by the eccentric spindle and restricted by an orbiting scroll anti-rotation crank pins to make a planar revolution in the seal chamber, the orbiting scroll is also meshed with the inner and outer fixed scrolls to form a series of crescent sealed gas chambers, the contacting line moves successively and the volumes of the formed crescent sealed gas chambers are gradually reduced from the outer edge to the center along with the movement of the orbiting scroll, and therefore, gas sucked in from the gas inlet on the outer edge of the inner fixed scroll is compressed and then exhausted through the exhaust port in the center of the inner fixed scroll.

The inner and outer fixed scrolls are respectively provided with a fixed scroll motherboard, one or more helical fixed scroll walls extending from the center to the outer edge are arranged on each fixed scroll motherboard, a seal groove is formed on the top of each fixed scroll wall, and a tip seal in sliding contact with an orbiting scroll motherboard on the opposite side is arranged in each seal groove. The orbiting scroll is provided with the orbiting scroll motherboard, one or more helical orbiting scroll walls extending from the center to the outer edge are symmetrically arranged on both sides of the orbiting scroll motherboard, a seal groove is formed on the top of each orbiting scroll wall, and a tip seal in sliding contact with the fixed scroll motherboard on the opposite side is arranged in each seal groove.

The orbiting scroll anti-rotation crank pin is connected with the inner casing which is used as the inner fixed scroll and the orbiting scroll respectively through a group of bearings. Three bearings are uniformly distributed and installed on one end of the orbiting scroll anti-rotation crank pin. A shock absorbing elastic ring on the orbiting scroll anti-rotation crank pin hole is made of elastic material with a square or circular cross section. The gas inlet is provided with an inlet gas filter. The inner casing which is also used as the inner fixed scroll is provided with a gas ballast valve. The fan wheel is provided with fan housing, and the coupling is provided with a coupling spider.

A single-sided oil-free scroll fluid machine, comprising a machine frame with a gas inlet on the outer edge and used as an inner casing, and an outer casing with an exhaust port and used as a fixed scroll, wherein the outer casing is butted with the machine frame which is used as the inner casing to form a seal chamber, an orbiting scroll which is installed on the eccentric part of an eccentric spindle through a group of bearings is arranged in the seal chamber, an axial fan is arranged on one end of the eccentric spindle, the eccentric spindle is connected with a drive motor through a coupling and a drive motor coupling and is eccentrically driven by the drive motor, the orbiting scroll is driven by the eccentric spindle and restricted by an orbiting scroll anti-rotation crank pins to make a planar revolution in the seal chamber, the orbiting scroll is also meshed with the fixed scroll to form a series of crescent compressed and sealed gas chambers, the contacting line moves successively and the volumes of the formed crescent sealed gas chambers are gradually reduced from the outer edge to the center along with the movement of the orbiting scroll, and therefore, gas sucked in from the gas inlet on the outer edge of the inner casing is compressed and then exhausted through the exhaust port in the center of the outer casing which is also used as the fixed scroll.

The fixed scroll is provided with a fixed scroll motherboard, one or more helical fixed scroll walls extending from the center to the outer edge are arranged on each fixed scroll motherboard, a seal groove is formed on the top of each fixed scroll wall, and a tip seal in sliding contact with an orbiting scroll motherboard on the opposite side is arranged in each seal groove. The orbiting scroll is provided with the orbiting scroll motherboard, one side of the orbiting scroll motherboard is provided with one or more helical orbiting scroll walls extending from the center to the outer edge and the other side of the orbiting scroll motherboard is in sliding connection with the eccentric part of the eccentric spindle. A seal groove is formed on the top of each orbiting scroll wall, and the tip seal in sliding contact with the fixed scroll motherboard on the opposite side is arranged in each seal groove.

The orbiting scroll anti-rotation crank pin is connected with the machine frame which is used as the inner casing and the orbiting scroll respectively through a group of bearings. A shock absorbing elastic ring in the orbiting scroll anti-rotation crank pin hole is made of elastic material with a square or circular cross section. The gas inlet is provided with an inlet gas filter. The eccentric spindle is provided with a spindle balance adjuster. The axial fan is provided with fan housing, and a coupling spider is fixed between the coupling and the spindle coupling.

The tip seal is used for clogging the top of each scroll wall and the scroll motherboard on the opposite side to form the crescent compressed and sealed gas chambers. The tip seal can be composed of a sealing element and an elastic supporting element bonded with the sealing element, and can also be an independent sealing element. The tip seal is made of composite materials, for example, teflon, fluororubber and ethylene-propylene-diene.

The orbiting scroll and fixed scroll can be designed with single scroll line, double scroll lines, triple scroll lines, or their combinations.

The coil number, height and thickness of the scroll wall in the seal chamber region of the oil-free scroll fluid machine can be changed in order to respectively or simultaneously provide vacuum or exhaust pressure to be used as a vacuum pump and a compressor at the same time.

The oil-free scroll fluid machine can be horizontal or vertical, and is especially suitable for pumping gas-liquid mixture and corrosive gas.

The oil-free scroll fluid machine provides a method for concentrating fluid, comprising the steps of introducing fluid to the oil-free scroll fluid machine to be used as a compressed gas supply source, and achieving special gas recovery and circulation by the oil-free scroll fluid machine.

Compared with the prior art, the oil-free scroll fluid machine of the present invention has the characteristics and advantages of compact structure, light weight, low noise, low vibration, low energy consumption, high efficiency and no pollution. The present invention is especially suitable for treating special fluid in analytical and testing instrument, semiconductor equipment, food and drug machinery, medical equipment and material preparation equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram for the overall structure of the double-sided oil-free scroll vacuum pump in the present invention.

FIG. 2 is the left view of FIG. 1.

FIG. 3 is an arrangement drawing for the single scroll line of the double-sided oil-free scroll vacuum pump in the present invention.

FIG. 4 is an arrangement drawing for the double scroll lines of the double-sided oil-free scroll vacuum pump in the present invention.

FIG. 5 is an arrangement drawing for the triple scroll lines of the double-sided oil-free scroll vacuum pump in the present invention.

FIG. 6 is an outline drawing of the double-sided oil-free scroll vacuum pump in the present invention.

FIG. 7 is a schematic diagram for the overall structure of the single-sided oil-free scroll vacuum pump in the present invention.

FIG. 8 is the left view of FIG. 7.

FIG. 9 is an arrangement drawing for the single scroll line of the single-sided oil-free scroll vacuum pump in the present invention.

FIG. 10 is an arrangement drawing for the double scroll lines of the single-sided oil-free scroll vacuum pump in the present invention.

FIG. 11 is an arrangement drawing for the triple scroll lines of the single-sided oil-free scroll vacuum pump in the present invention.

FIG. 12 is an outline drawing of the horizontal single-sided oil-free scroll vacuum pump in the present invention.

FIG. 13 is an outline drawing of the vertical single-sided oil-free scroll vacuum pump in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention is described in details by the embodiments as follows, and the scope of the present invention is not only limited by the following embodiments:

Embodiment 1

As shown in FIGS. 1 and 2, this embodiment of the present invention is a double-sided oil-free scroll vacuum pump, comprising a machine frame 27, an inner casing 18 and an outer casing 16, wherein the inner casing is fixed on the machine frame, provided with a gas inlet 40 on the outer edge and an exhaust port 29, and is used as an inner fixed scroll, the outer casing is used as an outer fixed scroll and is butted with the inner casing 18 which is used as the inner fixed scroll to form a seal chamber, an orbiting scroll 1 which is installed on the eccentric part of an eccentric spindle 7 through bearings 11 and 12 is arranged in the seal chamber, a fan wheel 13 and a coupling fan wheel 37 are respectively arranged on both ends of the eccentric spindle 7, the eccentric spindle 7 is connected with a drive motor 31 through a coupling 34 and is eccentrically driven by the drive motor 31, the orbiting scroll 1 is driven by the eccentric spindle 7 and restricted by an orbiting scroll anti-rotation crank pin 22 to make a planar revolution in the seal chamber, the orbiting scroll is also meshed with the inner and outer fixed scrolls to form a series of crescent sealed gas chambers, the contacting line moves successively and the volumes of the formed crescent sealed gas chambers are gradually reduced from the outer edge to the center along with the movement of the orbiting scroll 1, and therefore, gas sucked in from the gas inlet 40 on the outer edge of the inner fixed scroll disk is compressed and then exhausted through the exhaust port 29 in the center of the inner fixed scroll.

The inner and outer fixed scrolls are respectively provided with a fixed scroll motherboard, one or more helical fixed scroll walls 44 extending from the center to the outer edge are arranged on each fixed scroll motherboard, a seal groove is formed on the top of each fixed scroll wall 44, and a tip seal 2 and a tip seal 3 in sliding contact with an orbiting scroll motherboard on the opposite side are arranged in each seal groove. The orbiting scroll is provided with the orbiting scroll motherboard, one or more helical orbiting scroll walls 45 extending from the center to the outer edge are symmetrically arranged on both sides of the orbiting scroll motherboard, a seal groove is formed on the top of each orbiting scroll wall 45, and a tip seal 4 in sliding contact with the fixed scroll motherboard on the opposite side is arranged in each seal groove.

The orbiting scroll anti-rotation crank pin 22 is connected with the inner casing which is used as the inner fixed scroll through a bearing 24, and is connected with the orbiting scroll through a bearing 21. A shock absorbing elastic ring 20 on the orbiting scroll anti-rotation crank pin 22 is made of elastic material with a square or circular cross section.

A screen cover 39 is arranged in the gas inlet 40 to be used as an inlet gas filter. The inner casing which is also used as the inner fixed scroll is provided with a gas ballast valve 30. The machine frame is provided with a base plate 28. The fan wheel 13 is provided with a fan housing 14. The eccentric spindle 7 is provided with an eccentric spindle seal 6. A coupling spider is fixed between the coupling fan wheel and the coupling.

The tip seal 2, tip seal 3 and tip seal 4 are used for clogging the top of each scroll wall and the scroll motherboard on the opposite side to form the crescent compressed and sealed gas chambers. Each tip seal can be composed of a sealing element and an elastic supporting element bonded with the sealing element, and can also be an independent sealing element. The tip seals are made of composite materials, for example, teflon, fluororubber and ethylene-propylene-diene.

As shown in FIG. 1, the oil-free scroll fluid machine also comprises the following parts and components: a clip ring 5, a clip ring 19, a retaining ring 8, a screw 9, a screw 15, a screw 25, a screw 32, a screw 41, a washer 10, a washer 26, a washer 33, a washer 42, an O-ring 17, an O-ring 43, a sleeve 23, a lifting eye bolt 35 and a key 38.

The coil number, height and thickness of the scroll wall in the seal chamber region of the oil-free scroll fluid machine can be changed in order to respectively or simultaneously provide vacuum or exhaust pressure to be used as a vacuum pump and compressor at the same time.

As shown in FIGS. 3, 4 and 5, the orbiting scroll and fixed scroll can be designed with single scroll line, double scroll lines, triple scroll lines or their combinations.

Embodiment 2

As shown in FIGS. 7 and 8, this embodiment of the present invention is a single-sided oil-free scroll vacuum pump, comprising a machine frame 18 with a gas inlet 40 on the outer edge and used as an inner casing, and an outer casing 16 with an exhaust port 29 and used as a fixed scroll 6, wherein the outer casing is butted with the machine frame which is used as the inner casing 18 to form a seal chamber, an orbiting scroll 1 which is installed on the eccentric part of an eccentric spindle 7 through a bearing 11 and a bearing 12 is arranged in the seal chamber, an axial fan 47 is arranged on one end of the eccentric spindle 7, the eccentric spindle 7 is connected with a drive motor 31 through a shaft balance coupling 53 and a drive motor coupling 34 and is eccentrically driven by the drive motor 31, the orbiting scroll 1 is driven by the eccentric spindle 7 and restricted by an orbiting scroll anti-rotation crank pin 22 to make a planar revolution in the seal chamber, the orbiting scroll is also meshed with the fixed scroll 16 to form a series of crescent compressed and sealed gas chambers, the contacting line moves successively and the volumes of the formed crescent sealed gas chambers are gradually reduced from the outer edge to the center along with the movement of the orbiting scroll 1, and therefore, gas sucked in from the gas inlet 40 on the outer edge of the inner casing is compressed and then exhausted through the exhaust port 29 in the center of the outer casing which is also used as the fixed scroll.

The fixed scrolls are respectively provided with a fixed scroll motherboard, one or more helical fixed scroll walls extending from the center to the outer edge are arranged on each fixed scroll motherboard, a seal groove is formed on the top of each fixed scroll wall, and a tip seal 2 in sliding contact with an orbiting scroll disk motherboard on the opposite side is arranged in each seal groove. The orbiting scroll is provided with the orbiting scroll motherboard, one side of the orbiting scroll motherboard is provided with one or more helical orbiting scroll walls extending from the center to the outer edge, and the other side of the orbiting scroll motherboard is in sliding connection with the eccentric part of the eccentric spindle 7. A seal groove is formed on the top of each orbiting scroll wall, and a tip seal 3 in sliding contact with the fixed scroll disk motherboard on the opposite side is arranged in each seal groove.

The orbiting scroll anti-rotation crank pin 22 is connected with the machine frame 18 which is used as the inner casing through a bearing 24, and is connected with the orbiting scroll through a bearing 21. A shock absorbing elastic ring 20 on the orbiting scroll anti-rotation crank pin 22 is made of elastic material with a square or circular cross section.

A screen cover 39 is arranged in the gas inlet 40 to be used as an inlet gas filter. The eccentric spindle 7 is provided with a balancing weight 49 used as a shaft balance adjuster. The axial fan 47 is provided with a fan housing 46. A coupling spider 36 is fixed between the coupling 34 and the spindle balance coupling 53.

The tip seal 2 and the tip seal 3 are used for clogging the top of each scroll wall and the scroll motherboard on the opposite side to form the crescent compressed and sealed gas chambers. Each tip seal can be composed of a sealing element and an elastic supporting element bonded with the sealing element, and can also be an independent sealing element. The tip seals are made of composite materials, for example, teflon, fluororubber and ethylene-propylene-diene.

As shown in FIG. 7, the oil-free scroll fluid machine also comprises the following parts and components: a clip ring 5, a clip ring 52, a retaining ring 8, a screw 9, a screw 15, a screw 25, a screw 32, a screw 41, a screw 50, a washer 26, a washer 33, a washer 42, an O-ring 17, an O-ring 43, an O-ring 48, a sleeve 23, a key 38, a support ring 51, a crank pin seal 54 and a bearing cap 55.

The coil number, height and thickness of the scroll disk wall in the seal chamber region of the oil-free scroll fluid machine can be changed in order to respectively or simultaneously provide vacuum or exhaust pressure to be used as a vacuum pump and a compressor at the same time.

As shown in FIGS. 9, 10 and 11, the orbiting scroll and fixed scroll can be designed with single scroll line, double scroll lines, triple scroll lines, or their combinations.

As shown in FIGS. 12 and 13, the oil-free scroll fluid machine can be horizontal or vertical, and is especially suitable for pumping gas-liquid mixture and corrosive gas. 

What is claimed is:
 1. An oil-free scroll fluid machine, comprising a machine frame, an inner casing fixed on the machine frame, and an outer casing, the inner casing being provided with a gas inlet and an exhaust port on an outer edge thereof and used as an inner fixed scroll, and the outer casing being used as an outer fixed scroll, wherein the machine is a double-sided oil-free scroll fluid machine, said inner fixed scroll is butted with the outer fixed scroll to form a seal chamber, an orbiting scroll which is installed on an eccentric part of an eccentric spindle through a group of bearings is arranged in the seal chamber, a fan wheel and a coupling fan wheel are respectively arranged on both ends of the eccentric spindle, the eccentric spindle is connected with a drive motor through a coupling and is eccentrically driven by the drive motor, the orbiting scroll is driven by the eccentric spindle and restricted by orbiting scroll anti-rotation crank pins to make a planar revolution in the seal chamber, the orbiting scroll is also meshed with the inner and outer fixed scrolls respectively to form a series of crescent sealed gas chambers, contacting lines move successively and volumes of the formed crescent sealed gas chambers are gradually reduced from an outer edge to a center along with the movement of the orbiting scroll, and therefore gas sucked in from the gas inlet on the outer edge of the inner fixed scroll is compressed and then exhausted through the exhaust port of the inner fixed scroll, wherein said inner and outer fixed scrolls are respectively provided with a fixed scroll motherboard, one or more helical fixed scroll walls extending from a center to an outer edge are arranged on each fixed scroll motherboard, a seal groove is formed on a top of each fixed scroll wall, and a tip seal in sliding contact with an orbiting scroll motherboard of said orbiting scroll on an opposite side thereof is arranged in each seal groove on said fixed scroll wall, and wherein said orbiting scroll is provided with the orbiting scroll motherboard, one or more helical orbiting scroll walls extending from a center to an outer edge are symmetrically arranged on both sides of the orbiting scroll motherboard, a seal groove is formed on a top of each orbiting scroll wall, and a tip seal in sliding contact with the fixed scroll motherboard on an opposite side thereof is arranged in each seal groove on said orbiting scroll wall.
 2. An oil-free scroll fluid machine, comprising a machine frame provided with a gas inlet on an outer edge thereof and used as an inner casing, and an outer casing provided with an exhaust port and used as a fixed scroll, wherein the machine is a single-sided oil-free scroll fluid machine, said inner casing is butted with the outer casing to form a seal chamber, an orbiting scroll which is installed on an eccentric part of an eccentric spindle through a group of bearings is arranged in the seal chamber, an axial fan is arranged on one end of the eccentric spindle, the eccentric spindle is connected with a drive motor through a coupling and a drive motor coupling and is eccentrically driven by the drive motor, the orbiting scroll is driven by the eccentric spindle and restricted by orbiting scroll anti-rotation crank pins to make a planar revolution in the seal chamber, the orbiting scroll is also meshed with the fixed scroll to form a series of crescent compressed and sealed gas chambers, a contacting line moves successively and volumes of the formed crescent sealed gas chambers are gradually reduced from an outer edge to a center along with the movement of the orbiting scroll, and therefore gas sucked in from the gas inlet on the outer edge of the inner casing is compressed and then exhausted through the exhaust port of the outer casing, wherein said fixed scroll is provided with a fixed scroll motherboard, one or more helical fixed scroll walls extending from a center to an outer edge are arranged on the fixed scroll motherboard, a seal groove is formed on a top of each fixed scroll wall, and a tip seal in sliding contact with an orbiting scroll motherboard on an opposite side thereof is arranged in each seal groove on said fixed scroll wall, and wherein said orbiting scroll is provided with the orbiting scroll motherboard, one side of the orbiting scroll motherboard is provided with one or more helical orbiting scroll walls extending from a center to an outer edge and the other side of the orbiting scroll motherboard is in sliding connection with the eccentric part of the eccentric spindle, a seal groove is formed on a top of said orbiting scroll wall, and a tip seal in sliding contact with the fixed scroll motherboard on an opposite side thereof is arranged in each seal groove on said orbiting scroll wall.
 3. The oil-free scroll fluid machine as claimed in claim 1, wherein said gas inlet is provided with an inlet gas filter.
 4. The oil-free scroll fluid machine as claimed in claim 2, wherein said gas inlet is provided with an inlet gas filter.
 5. The oil-free scroll fluid machine as claimed in claim 1, wherein said tip seal is composed of a sealing element and an elastic supporting element bonded with the sealing element, or is an independent sealing element.
 6. The oil-free scroll fluid machine as claimed in claim 2, wherein said tip seal is composed of a sealing element and an elastic supporting element bonded with the sealing element, or is an independent sealing element.
 7. The oil-free scroll fluid machine as claimed in claim 1, wherein a shock absorbing elastic ring on said orbiting scroll anti-rotation crank pin is made of elastic material with a square or circular cross section.
 8. The oil-free scroll fluid machine as claimed in claim 2, wherein a shock absorbing elastic ring on said orbiting scroll anti-rotation crank pin is made of elastic material with a square or circular cross section.
 9. The oil-free scroll fluid machine as claimed in claim 1, wherein said orbiting scroll and fixed scroll is designed with single scroll line, double scroll lines, triple scroll lines, or their combinations.
 10. The oil-free scroll fluid machine as claimed in claim 2, wherein said orbiting scroll and fixed scroll is designed with single scroll line, double scroll lines, triple scroll lines, or their combinations.
 11. The oil-free scroll fluid machine as claimed in claim 1, wherein said machine is horizontal or vertical.
 12. The oil-free scroll fluid machine as claimed in claim 2, wherein said machine is horizontal or vertical.
 13. The oil-free scroll fluid machine as claimed in claim 1, wherein said inner casing which is used as the inner fixed scroll is provided with a gas ballast valve.
 14. The oil-free scroll fluid machine as claimed in claim 1, wherein three bearings are uniformly distributed and installed on one end of said orbiting scroll anti-rotation crank pin.
 15. The oil-free scroll fluid machine as claimed in claim 2, wherein said eccentric spindle is provided with a spindle balance adjuster. 